just responding back to this, yes. And think about it, there was a big battle scene involving Thor and Loki and probably Dark Elves in Iceland, so that would require some time for stunts, etc, and then they still went to at least 2 other places in Iceland in 6 days time? That'll be a short battle, certainly not nearly as long as Bourne or Greenwich.

actually 4 locations in Iceland apparently... according to this article.